18123497 has 4 divisors (see below), whose sum is σ = 20712576. Its totient is φ = 15534420.

The previous prime is 18123493. The next prime is 18123503. The reversal of 18123497 is 79432181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79432181 = 521 ⋅152461.

It is a cyclic number.

It is not a de Polignac number, because 18123497 - 2² = 18123493 is a prime.

It is a super-2 number, since 2×18123497² = 656922287018018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18123493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1294529 + ... + 1294542.

It is an arithmetic number, because the mean of its divisors is an integer number (5178144).

Almost surely, 2^18123497 is an apocalyptic number.

It is an amenable number.

18123497 is a deficient number, since it is larger than the sum of its proper divisors (2589079).

18123497 is an equidigital number, since it uses as much as digits as its factorization.

18123497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589078.

The product of its digits is 12096, while the sum is 35.

The square root of 18123497 is about 4257.1700694241. The cubic root of 18123497 is about 262.6721326032.

The spelling of 18123497 in words is "eighteen million, one hundred twenty-three thousand, four hundred ninety-seven".